User:RaubieR/sandbox

Structure of the Brain---

As previously mentioned, the primary role of the longitudinal fissure of the brain is to separate the brain into the two hemispheres (i.e. the left and right hemisphere). However, the longitudinal fissure also involves and interacts with the falx cerebri and corpus callosum.

How is the longitudinal fissure formed during development?

The longitudinal fissure develop during... (already in article but this is where I'll insert the rest of the info.) It is formed during embryonic development, where the neural plate folds in order to form a cavity called the neural tube. This process is also known as neurulation. The neural tube is where the central nervous system forms, which later on in development will be subdivided and differentiated into distinct sections of the brain and spinal cord. These subdivision occur by signaling molecules that direct differentiated cells to their correct location of the organism.

A neural crest appears in the mammalian embryo as soon as the 20th day of development. It is during embryonic development that a neural tube appears and is folded into a hollow structure, as shown in Figure 1. This process is also known as neurulation. The neural tube is where the central nervous system forms, which later on in development will be subdivided and differentiated into distinct sections of the brain and spinal cord. These subdivisions occur by signaling molecules that direct differentiated cells to their correct location of the organism. The bilateral sides of this structure then give rise to the two hemispheres of the Homo sapiens cortex but do not merge at any point besides the corpus callosum. As a result, the longitudinal fissure is formed. The longitudinal fissure can appear as early as the eighth week of development, and distinctly separates the two hemispheres by around the tenth gestational week.